I think this is a great question. @Peter A. Merkel et al (NCT01933724) have conducted a study to answer that question (conveniently called TAPIR). In their analysis that was presented 1 week ago at the International Vasculitis Workshop, they found that patients on low-dose prednisone along with othe...

Prior to the preferred nomenclature change from Wegener's granulomatosis to granulomatosis with polyangiitis, prior to the availability of routine ANCA testing, and prior to the general acceptance of first-line treatment with rituximab, two peer-reviewed publications reported on the treatm...